BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Beaver Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 104 species recorded across 52 survey years, still active.

104Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
52Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2025Span
6Observers

Bird Species Found on Pennsylvania Beaver

Top 40 of 104 species by most recent count. Each links to its species trend.

Species recorded on the Beaver route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
American RobinTurdidae1332025+67%1971
European StarlingSturnidae742025+34%1971
Song SparrowPasserellidae482025+28%1971
Red-winged BlackbirdIcteridae452025-58%1971
Red-eyed VireoVireonidae432025+255%1971
Northern CardinalCardinalidae422025+126%1971
Chimney SwiftApodidae362025+248%1971
American CrowCorvidae342025+106%1971
Gray CatbirdMimidae332025+116%1971
Cedar WaxwingBombycillidae282025+489%1985
Chipping SparrowPasserellidae252025+66%1971
American GoldfinchFringillidae242025+48%1971
Tufted TitmouseParidae242025+256%1972
Carolina WrenTroglodytidae23202511×1974
Yellow WarblerParulidae222025+514%1972
Mourning DoveColumbidae212025+168%1971
House SparrowPasseridae212025-62%1971
Brown-headed CowbirdIcteridae172025+82%1971
Wood ThrushTurdidae172025-12%1971
Blue JayCorvidae152025+193%1972
Common GrackleIcteridae152025-30%1971
Common YellowthroatParulidae152025+78%1971
House FinchFringillidae152025+600%1982
Eastern Wood-PeweeTyrannidae132025+471%1973
Eastern TowheePasserellidae132025+33%1971
Northern House WrenTroglodytidae132025+15%1971
Indigo BuntingCardinalidae122025+181%1971
Barn SwallowHirundinidae92025+25%1971
Eastern PhoebeTyrannidae82025+56%1971
Canada GooseAnatidae82021-36%1992
Scarlet TanagerCardinalidae72025+425%1978
Red-bellied WoodpeckerPicidae72025+675%1991
Downy WoodpeckerPicidae62025+46%1971
Northern MockingbirdMimidae62025+138%2009
Warbling VireoVireonidae62025+200%2011
Carolina ChickadeeParidae52025+80%2008
Eastern KingbirdTyrannidae42025+150%1976
Baltimore OrioleIcteridae42025+280%1972
Rose-breasted GrosbeakCardinalidae42025+200%1979
Willow FlycatcherTyrannidae42025+275%1981

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.